How to get Lenovo PowerDVD 10 to work?

It used to work like a charm, but now it won't even load and always stops working before my movies even come on.

Power DVD is normally a paid for program and is either supplied with a new computer as a trial or a reduced facility program. So perhaps yours was a trial program.
Download free VLC that will play virtually anything

If you have the disk, uninstall, reboot and then reinstall it.